Bolt-lock.



No. 702,255. Patented .Iune I0, 1902.

- H. A. STUCKMAN.

BOLT LOCK.

(Application filed Nov. 5, 1901.) (No Model.) 28heets-Sheet l.

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UNITED STATES PATENT OFFICE.

HARRY AIIGUST STOCKMAN, OF JOI'IANNESBURG, SOUTH AFRICAN REPUBLIC.

BOLT-LOCK.

srnormcaprron forming part of Letters Patent No. 702,255 dated June 10,1902. Application filed November 5,1901. Serial No. 81,180. (No model.)

T all whom it may concern.-

Be it known that I, HARRY AUGUST STooK- MAN, a subjectofthe King ofSweden and Norway, residing at Johannesburg, South African Republic,have made certain new and useful Improvements in BoltLooks, of which thefollowing is a specification.

My invention is an improvement in boltlocks, and particularly in thatclass of such locks illustrated in my former application for patent,Serial No. 68,484., filed in the United States Patent Ofiice July 16,1901, and the present invention is designed for use with one bolt in anywooden or similar structure where lag-screws are employed; and thepresent invention consists in certain novel constructions andcombinations of parts, as will be hereinafter described and claimed.

r p In the drawings, Figure 1 is a sectional side View of my inventionas in use. Fig. 2 is a cross-sectional view on about line 2 2 of Fig. 1.

Fig. 3 is a longitudinal section of the invention as applied to andsecured in the wooden beam previous to being expanded to the positionshownin Fig. 1. Fig.4 is a longitudinal section of the locking device onabout line 4 4 of Fig. 6. Fig. 5 is a cross-section through the end ringof the locking device, and Fig. 6 is a longitudinal section of thelockingdevice on a line at right angles to that shown in Fig. 1. Figs. 4and 6 show a somewhat different construction from that shown in Figs. 1,2, and 3.

My former invention before referred to is especially designed forshaftwork in mines, where two bolts or lag-screws are secured fromopposite sides. I My present invention has a more general application,and provides a looking device by which the insertion of the bolt fromone side will operate to make the lock or holder fast in its place andalso secure the bolt from accidentally loosening.

In the present invention the locking device includes an end ring A andlocking bars or sections B, which are secured at one end to the ring A,being formed integrally therewith, and are separated throughout theirlengths at both edges, having their ends free and arranged to beexpanded from the position shown in Fig. 3 to that shown in Fig. 1 bythe I insertionof the bolt to the position shown in fore it is insertedin the hole 0 in the timber D. In this position the bars or arms B are"spaced apart and occupy the position they do when expanded withinthehole C, as shown in Fig. 1. It will be noticed that the connection ofthe arms B with the end rings A at B is somewhat reduced, so the armscan be readily bent at such point by the entering screw or bolt toexpand the holder to the position shown in Fig. 1. Immediately adjacentto their ends 11 the arms B are tapered at B gradually enlarging andforminga wedge or taper, whereby the free endsof the arms may becompressed from the position shownin Fig. 6 to that shownin Fig. 3, thearms being reduced in diameterfrom the innerends of the tapers B towardthe ring A. Thisreduction in diameter of the arms may be gradual, asshown in Fig. 6; but it is preferred to provide the construction shownin Fig. 3, wherein the holder is provided with ribs E, extendinglongitudinally of its arms at the center thereof, and abrupt shouldersare formed at F F, facing toward the ringA, by which to prevent thewithdrawal of the holder when the samehas been expanded from theposition shown in Fig. 3 to that shown in Fig. 1 by the introduction ofthe bolt Gin the use of the device. The ribs E operate to prevent anyturning of the holder within the beam D and form braces for the shoulderportions F F, which extend on opposite sides of the said rib, as will beunderstood from Figs. 1 and 2.

In the operation of the invention a hole is bored in the beam equal tothe diameter of the ringA anda depth equal to the length of the nut orholder. The nut is driven into this hole with a hammer or mallet untilit reaches the bottom of the hole,when the shape of the nut and thetaper of its arms will force the free ends of its arms together to theposition shown in Fig. 3. The bolt isthen' inserted and screwed home,when it will force the projections or shoulders into the wood, causingthe nut or holder tobind in the beam and to grip the bolt so tightlythat it will withstand a great deal of vibration before it becomesloose.

While the invention is especially intended for use in wood, it may alsobe employed in connection with stone or concrete. In fastening in astone, the hole should be drilled and the nut inserted and a piece ofwood put in the hole, while the surrounded space is filled with lead orsome other substance, after-Which the wood may be removed and the boltinserted to expand the arms, as before described.

In Fig. 4 I show the arms provided with a single shoulder, while in Fig.6 the construction is modified by the provision of a gradual inclinebetween the end ring and the taper at the free ends of the arms B.

It will be understood that the arms of my holder are threadedinternally, as shown, to receive the bolt, and that the said arms arecompressed at their free ends by their introduction into the hole in thebeam formed to receive them and are then expanded by the insertion ofthe bolt, as shown in'Fig. 1.

Having thus described my invention, what I'claim as new, and desire tosecure by Letters Patent, is

In a bolt-lock, a holder for the bolt comprising an end ring, armsprojecting from said ring and separated throughout their lengths at bothedges, and having their extremities HARRY AUGUST STOOKMAN,

. Witnesses:

J AS. 1). RANDALL, K. L. OWEN.

